RESEARCH ON THE TEMPORARY SHIELDING PLUGGING EXPERIMENT IN CONSIDERING FRACTURE-PORE RESERVOIR OF FRACTURE WIDTH AND PRESSURE DIFFERENCE

The temporary shielding researches of fracture - pore reservoir are less than pore reservoir. And it doesn t consider the influence of the fracture width and positive differential pressure. So it is necessary to research difference fracture wide and pressure to keep shielding temporary. This paper appraises the modified mud in the Northeast in Sichuan basin. Regarding carbonate rock as experimental core, the temporary shielding experiment is done when fracture width of core is 10 m,20 m,50 m and pressure difference is 1 MP,2 MPa,3 MPa and 4 MPa. The research indicates: the effect of temporary shielding rate in the transformed mud is well to the fracture width from 10 m -50 m. When the mud is matching to granularity peak value, the temporary shielding effect is the best. If the fracture width of core is about 10 m, the rational pressure difference of temporary plugging is 2 MPa.